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' S. ELLIOTT. W'ood Turning; Machine. No. 240,584. Patented Aprfil 26, I881.

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.(No Model.) 2 Sheets-Sheet 2 s. ELLIOTT. Wood Turning Machine.

No. 240,584. Patented April 26, 1881.

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UNITED STATES PATENT OFFICE.

STERLING ELLIOTT, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF TWO- THIRDS TO HENRY R. THOMPSON, OF SAME PLACE.

TWOOD-TURNING MACHINE.

SPECIFICATION forming part of Letters Patent No. 240,584, dated April 26, 1881.

Application filed September 9, 1880. (No model.)

To all whom it may concern:

Be it known that I, STERLINGELLIOTT, of the city of Boston, county of Suffolk, and State of Massachusetts, have invented certain useful Improvements in Wood-Turning Machines; and I hereby declare that the following is a full and exact description of the same, reference beinghad to the accompanying drawings, making a part of this specification, of which- Figure l is a plan view of the top. Fig. 2 is a view of the cone-pulleys. Fig. 3 shows the end of the entire-machine with frame taken away. Fig. 4 is a vertical cross-section of the main arbor, taken on the line as y of Fig. 1. Fig. 5 is a cross-section of same on the line o w of Fig. 4. Fig. 6 is an end view of the hollow arbor D, and shows the anti-friction rollers K K K K.

The object of my invention is to provide a means by which square pieces of wood of any length may be revolved and fed forward continuously, and at the same time turned to any required design by a vertically-oscillati n g tool, which is governed in its movements by a revolving cam or former. This is accomplished by means of a hollow revolving mandrel havingasquare aperture, bypassing through which the wood is revolved. A continuous forward motion is imparted to the wood by revolving it within a female screw, which may be fixed, or it may have a rotary motion somewhat slower than that of the timber which is passing through it.

The revolving and feeding mechanism is shown in section at Fig. 4. The feed-screw L is supported upon a tube inside the main arbor D. In practice it is found necessary to make this screw of a very coarse pitch, in order to avoid splitting ofi' the corners of the wood betweenthethreadsofthescrew. Astheamount of wood which maybe safely removed by the cutters at each revolution is much less than the necessary pitch of feed-screw the screw is allowed to revolve with the wood, but at a slower 5 speed, their relative motions being regulated by two pairs of diiferential gears, E F and e f. To accomplish this the larger gearsE and F are rigidly attached to a single shaft. The small gear 6 is fixed to the tube D, which, by

means of its square aperture, revolves the wood. The small gear f is fastened upon the outer end of the inner tube, which tube carries upon its opposite end the feeding-screw L; hence it follows that a variation in the relative sizes of the two pairs of gears will make adifference between the speed of the feed'screw and that of the wood within it, which will cause the wood to move forward in proportion to that difference. The first turn or thread of the feedscrew has teeth formed upon its edge like a saw, as shown at N, Figs. 4 and 5. These teeth.

out a spiral groove upon the four corners ofa piece of wood, (just as a screw is out by a die,) and the remaining threads follow in this groove, causing the wood to move forward. The square aperture in the end of arbor D is preferably made of four rollers, as shown in Fig. 6. i

(9/, Fig. 1, is a tapered shell or bearing havin g a stationary knife, which rounds the wood, leaving its sides parallel, and furnishing a bearing by which the wood is held while being finished by the tool h. The finishing-tool h is held by the vertically-oscillating tool-holder H, as shown in Figs. 1 and 3. The motion of the tool-holder H is governed by the cam I. As the rotary and forward motions of the timber are uniform, it follows that the length of the handle, chair-round, pen-holder, or other article being turned will be determined by. the speed with which thecam I revolves. This is regulated by the cone-pulleys J J, the position of the belt being maintained by the movable guide M.

The mode of operation is as follows: The timber to be operated upon is passed through the hollow mandrel from the end marked 00, and, after being turned through the feed-screw L, is caught and revolved by the rollers K K K K, which also revolve upon their own centers, and thereby offer less resistance .to the forward motion of the wood which they revolve.

What I claim as new, and desire to secure by Letters Patent, is-

1. In a wood-turning machine, the hollow mandrel D, having within it the screw-carrying mandrel, in combination with gearing for maintaining between said mandrels a uniform difference of speed, substantially as shown and 1 described.

2. In awood-turning machine,tl1e verticallyfeeding forward the material substantially as 10 oscillating tool-holder H, in combination with shown and. described. the forming-cam I and cone-pulleys J J, for op- In testimony that I claim the above I have crating the same substantially as shown and hereunto subscribed my name in the presence 5 described. of two witnesses.

3. In a wood-turning machine, the combination of the two hollow mandrels D and L, and Witnesses: the differential gears E F and e f, acting to- F. N. lVEsT, gether to produce the effect of revolving and I WILLIAM W. SIBLEY.

STERLING ELLIOTT. 

